The main division of the Quran is into chapter (surah) and verse (ayat). The Quran is additionally divided into 30 equal sections, called juz (plural: ajiza).
This is the first Juz of 30. Recited by Sheikh Abu Bakr Ash-Shatiri.
For Explanation (Commentary) please visit: http://tafsir.com
Another video of Juz' 1: http://vimeo.com/10523557